Rancher Fiona Boyd was leading a stray calf into a shed when the calf's enraged mother suddenly charged her, knocked her down and proceeded to stampede over her. “I was absolutely terrified, and remember rolling up into a ball to protect my head from her hooves,” she recalled. That's when Kerry, who was grazing nearby, immediately leaped to assist her. The horse bucked and kicked at the cow until it moved away, likely saving Boyd from being trampled to death.